Choose

any

number

of

target

players

or

planeswalkers.

For

each

of

them,

reveal

cards

from

the

top

of

your

library

until

you

reveal

a

nonland

card,

Kaboom!

deals

damage

equal

to

that

card's

mana

value

to

that

player

or

planeswalker,

then

you

put

the

revealed

cards

on

the

bottom

of

your

library

in

any

order.